code: def p_col_list(p):
      """col_list : col_list COMMA col"""
      p[0] = p[1] + [p[3]]
  
imports: import yaml
  from guild import _yacc
  from .None import Select, Scalar, Attr, Flag
  from .None import ParseError
  from .None import qlex
label_desc: Use image node_id 4 for calling a global function with example usage: p_col_list(p) without return types